Hach SD900 Manuel D'utilisation De Base page 22

Restore the default calibration
The volume calibration for the liquid sensor can be returned to the default factory settings.
1. Select PROGRAM SETUP>MODIFY SELECTED>LIQUID SENSOR>ENABLE to make sure that
the liquid sensor is enabled.
2. Push VOLUME CALIBRATION and select RESET CAL. The volume calibration is set to the
default settings. The message "value has been reset to 0" will be shown.
Calibrate the sample volume with the liquid sensor
Calibrate the sample volume with the liquid sensor enabled to adjust sample volumes slightly.
1. Go to PROGRAM SETUP>MODIFY SELECTED>LIQUID SENSOR>ENABLE to make sure that
the liquid sensor is enabled.
2. Put the intake tubing into the sample water or tap water.
Note: Use the sample water for best accuracy.
3. Put the tubing from the outlet side of the pump into a graduated cylinder.
4. Push VOLUME CALIBRATION and select CALIBRATION.
5. Select START. The pump operates in reverse to purge the intake tube. The pump then operates
in the forward direction and collects the sample volume that is specified in the sampling program.
The pump operates in reverse to purge the intake tube.
6. When the sample has been collected, select DONE. Compare the volume of the sample in the
graduated cylinder with the sample volume that is entered in the program setup menu.
7. If the volume that was collected is different from the sample volume in the current program, enter
the volume that was actually collected. Push ENTER. The sensor is adjusted to accurately
measure all programmed volumes.
8. Select START to start the sampling program or CANCEL to exit the volume calibration menu.
Calibrate the sample volume manually
When the liquid sensor is disabled, all volumes must be calibrated manually by time. The sample
volume is calibrated for the volume specified in the current program. If the sample volume is changed
in the program, the sample volume must be calibrated again for the new volume.
1. Select PROGRAM SETUP>MODIFY SELECTED>LIQUID SENSOR>DISABLE to make sure that
the liquid sensor is disabled.
2. Put the intake tubing into the sample water or tap water.
3. Put the tubing from the outlet side of the pump into a graduated cylinder.
4. Push VOLUME CALIBRATION. If more than one volume is shown, select one of the volumes for
calibration.
5. Select START. The pump operates in reverse to purge the intake tube. The pump then operates
in the forward direction and starts to collect the sample.
6. Stop the pump at the selected volume or rinse location:
• Sample volume: push STOP when the volume that is specified in the main program is
collected.
• Rinse: push STOP when the liquid in the intake tubing gets to the liquid detector.
• Storm volume: push STOP when the volume specified in the stormwater program is collected.
7. Select DONE to go to the next volume calibration or REPEAT to do the calibration again.
8. When all volumes have been calibrated, select DONE.
9. Connect the outlet tubing to the tube fitting on the sampler.
10. Select START to start the sampling program or CANCEL to exit.
22 English